Amherst is a town in northwestern Nova Scotia, Canada, located at the northeast end of the Cumberland Basin, an arm of the Bay of Fundy, and 22 km (14 mi) south of the Northumberland Strait. The town sits on a height of land at the eastern boundary of the Isthmus of Chignecto and Tantramar Marshes, 3 km (1.9 mi) east of the interprovincial border with New Brunswick and 65 km (40 mi) southeast of the city of Moncton. It is 60 km (37 mi) southwest of the New Brunswick abutment of the Confederation Bridge to Prince Edward Island at Cape Jourimain.

The Bay of Fundy is a bay between the Canadian provinces of New Brunswick and Nova Scotia, with a small portion touching the U.S. state of Maine. It is an arm of the Gulf of Maine. Its tidal range is the highest in the world. The name is probably a corruption of the French word fendu, meaning 'split'.